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Fix struct ret in variadic fct with ARM hardfloat

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The procedure calling standard for ARM architecture mandate the use of
the base standard for variadic function. Therefore, hgen float aggregate
must be returned via stack when greater than 4 bytes and via core
registers else in case of variadic function.

This patch improve gfunc_sret() to take into account whether the
function is variadic or not and make use of gfunc_sret() return value to
determine whether to pass a structure via stack in gfunc_prolog(). It
also take advantage of knowing if a function is variadic or not move
float result value from VFP register to core register in gfunc_epilog().
This commit is contained in:
Thomas Preud'homme
2014-01-06 22:27:39 +08:00
parent bcc1904f9c
commit 8efaa71190
7 changed files with 35 additions and 23 deletions
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3
x86_64-gen.c
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@ -658,7 +658,7 @@ void gen_offs_sp(int b, int r, int d)
/* Return the number of registers needed to return the struct, or 0 if
returning via struct pointer. */
ST_FUNC int gfunc_sret(CType *vt, CType *ret, int *ret_align)
ST_FUNC int gfunc_sret(CType *vt, int variadic, CType *ret, int *ret_align)
{
int size, align;
*ret_align = 1; // Never have to re-align return values for x86-64
@ -833,6 +833,7 @@ void gfunc_prolog(CType *func_type)
/* if the function returns a structure, then add an
implicit pointer parameter */
func_vt = sym->type;
func_var = (sym->c == FUNC_ELLIPSIS);
size = gfunc_arg_size(&func_vt);
if (size > 8) {
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);